Home » Public Forums » GMCnet » New engine - Smog or no smog
| New engine - Smog or no smog [message #125214] |
Mon, 09 May 2011 13:56  |
Rickmo
Messages: 105
Registered: January 2011
Location: Gladwin, Michigan
Karma: 0
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Senior Member |
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When looking for replacement engine I keep getting asked if it is Smog or No Smog. Anybody know which it is?
By the way, thanks for the advice you have been providing for my dilema!
Rick
Rick Seebeck
Gladwin Michigan
1973 Canyon Lands
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| Re: New engine - Smog or no smog [message #125222 is a reply to message #125214] |
Mon, 09 May 2011 14:27  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Nothing on these truck engines
No air pump or even EGR
We usually block the intake crossover too
Also look for J heads, smaller port, SHOULD be cheaper
C heads work, but usually more $$
J heads SHOULD produce a little more low end torque
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: New engine - Smog or no smog [message #125228 is a reply to message #125214] |
Mon, 09 May 2011 14:55 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| Rickmo wrote on Mon, 09 May 2011 11:56 |
When looking for replacement engine I keep getting asked if it is Smog or No Smog. Anybody know which it is?
By the way, thanks for the advice you have been providing for my dilema!
Rick
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Marsha has a spare motor. (Listed in another thread.) A little used, but a LOT cheaper.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: New engine - Smog or no smog [message #125240 is a reply to message #125214] |
Mon, 09 May 2011 15:57 |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
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Jim's got it mostly right on California, but sad to say for me and others with GMCs, the requirement for smog testing in California begins with 1976 vehicles, not 1977.
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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| Re: New engine - Smog or no smog [message #125250 is a reply to message #125240] |
Mon, 09 May 2011 16:50 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| captjack wrote on Mon, 09 May 2011 13:57 |
Jim's got it mostly right on California, but sad to say for me and others with GMCs, the requirement for smog testing in California begins with 1976 vehicles, not 1977.
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I am fairly sure that Jim was talking about if the engine was equipped as a "smog" motor when new... NOT if it currently needs to have a smog check. Different things.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] New engine - Smog or no smog [message #125258 is a reply to message #125250] |
Mon, 09 May 2011 17:26 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Ex Governor Tom McCall had it about right when he was quoted as saying
"Don't Californicate Oregon, you are welcome to visit, but don't bring your
rules and regulations and set up camp."
CAFE regs in your state don't have to have a legitimate basis to exist, they
are primarily revenue generators, although the LA Basin's air is easier to
breathe in Aug/Sept than it used to be in the 70's.<Grin>TIC
Jim Hupy
Salem, Or
78 GMC Royale 403
On Mon, May 9, 2011 at 2:50 PM, Mike Miller <m000035@gmail.com> wrote:
>
>
> captjack wrote on Mon, 09 May 2011 13:57
> > Jim's got it mostly right on California, but sad to say for me and others
> with GMCs, the requirement for smog testing in California begins with 1976
> vehicles, not 1977.
>
>
> I am fairly sure that Jim was talking about if the engine was equipped as a
> "smog" motor when new... NOT if it currently needs to have a smog check.
> Different things.
> --
> Mike Miller -- Hillsboro, OR -- on the Black list
> '73 26' exPainted D. -- `78 23' Birchaven Rear Bath -- `77 23' Birchaven
> Side Bath
> http://m000035.blogspot.com
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] New engine - Smog or no smog [message #125260 is a reply to message #125222] |
Mon, 09 May 2011 17:33 |
ejuk8em
Messages: 90
Registered: July 2010
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Ok.. I have to ask. The last post to this thread mentions blocking the crossover inside the intake. How is that done? I've looked through valley pan gasket part numbers/illustrations (Sealed Power etc) and none of them blocked that passage (either in the 455 or 425). Is there a special part number for a valley pan that blocks that off or is it done some other way???
Thanks,
Lyle
Lyle A. Rigdon, Retired Superintendent
'73 Pineapple Yellow Sequoia
Pawnee, IL 62558
Pawnee Pride - Live It!
--- On Mon, 5/9/11, Keith V <my427v8@hotmail.com> wrote:
From: Keith V <my427v8@hotmail.com>
Subject: Re: [GMCnet] New engine - Smog or no smog
To: gmclist@temp.gmcnet.org
Date: Monday, May 9, 2011, 2:27 PM
Nothing on these truck engines
No air pump or even EGR
We usually block the intake crossover too
Also look for J heads, smaller port, SHOULD be cheaper
C heads work, but usually more $$
J heads SHOULD produce a little more low end torque
--
Keith
69 Vette
29 Dodge
75 Royale GMC
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| Re: [GMCnet] New engine - Smog or no smog [message #125265 is a reply to message #125260] |
Mon, 09 May 2011 18:00 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Blocking the heat riser passage through the intake manifold is usually
accomplished by inserting a plate of stainless steel that is the same
thickness as the compressed intake manifold gasket. The intake gasket is cut
to the exact size of the plate, and the whole combination is sandwiched
between the heads and the intake manifold. I believe that Dick Paterson has
a set already so configured for sale. There are other methods, replacing the
iron manifold with a Rockwell Aluminum one, filling the iron manifold with
foundry metal, and probably others too. Several on this forum have had
varying degrees of sucess with several of these methods. I guess it depends
on if your OEM manifold is heat cracked on the lifter valley from overheat.
If you remove your manifold, be sure to inspect the bottom side as well as
down the carb throat for cracks. I have seen many of them cracked.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Mon, May 9, 2011 at 3:33 PM, Lyle A. Rigdon <ejuk8em@yahoo.com> wrote:
> Ok.. I have to ask. The last post to this thread mentions blocking the
> crossover inside the intake. How is that done? I've looked through valley
> pan gasket part numbers/illustrations (Sealed Power etc) and none of them
> blocked that passage (either in the 455 or 425). Is there a special part
> number for a valley pan that blocks that off or is it done some other way???
> Thanks,
> Lyle
>
> Lyle A. Rigdon, Retired Superintendent
> '73 Pineapple Yellow Sequoia
> Pawnee, IL 62558
> Pawnee Pride - Live It!
>
> --- On Mon, 5/9/11, Keith V <my427v8@hotmail.com> wrote:
>
>
> From: Keith V <my427v8@hotmail.com>
> Subject: Re: [GMCnet] New engine - Smog or no smog
> To: gmclist@temp.gmcnet.org
> Date: Monday, May 9, 2011, 2:27 PM
>
>
>
>
> Nothing on these truck engines
> No air pump or even EGR
>
> We usually block the intake crossover too
>
> Also look for J heads, smaller port, SHOULD be cheaper
> C heads work, but usually more $$
>
> J heads SHOULD produce a little more low end torque
> --
> Keith
> 69 Vette
> 29 Dodge
> 75 Royale GMC
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] New engine - Smog or no smog [message #125267 is a reply to message #125265] |
Mon, 09 May 2011 18:17 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Here's a way to NOT block the crossover:
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3057
Here's one way TO block it:
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3115
The SS plates are easiest & probably as effective -- UNLESS the manifold is
cracked, then the pouring or replacement are the only solutions.
<http://www.gmcmhphotos.com/photos/showgallery.php?cat=3115>
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Mon, May 9, 2011 at 7:00 PM, James Hupy <jamesh1296@gmail.com> wrote:
> Blocking the heat riser passage through the intake manifold is usually
> accomplished by inserting a plate of stainless steel that is the same
> thickness as the compressed intake manifold gasket. The intake gasket is
> cut
> to the exact size of the plate, and the whole combination is sandwiched
> between the heads and the intake manifold. I believe that Dick Paterson has
> a set already so configured for sale. There are other methods, replacing
> the
> iron manifold with a Rockwell Aluminum one, filling the iron manifold with
> foundry metal, and probably others too. Several on this forum have had
> varying degrees of sucess with several of these methods. I guess it depends
> on if your OEM manifold is heat cracked on the lifter valley from overheat.
> If you remove your manifold, be sure to inspect the bottom side as well as
> down the carb throat for cracks. I have seen many of them cracked.
>
>
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GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] New engine - Smog or no smog [message #125282 is a reply to message #125277] |
Mon, 09 May 2011 18:53 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I would say that if the bottom of the manifold is cracked, but the area
directly under the carburetor is intact, I would fill the manifold and use
it. If the carb area is cracked, I would replace the manifold. Your choice
of Rockwell or find a good used Toronado manifold. On the 403, an Edelbrock
Performer is a direct bolt on and is a lot less money than the Rockwell for
the 455. The Rockwell is a custom part produced in small quantities, and
that determines the price. When installed correctly, they solve the
crossover problem and save a bunch of weight in the process.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Mon, May 9, 2011 at 4:38 PM, Larry Davick <ljdavick@comcast.net> wrote:
> If an intake manifold is cracked is it likely that filling the crossover
> will also fill the cracks? Or do the cracks generally happen outside the
> crossover path. If a manifold is cracked is it useless?
>
> Larry Davick
> Fremont, California
> The Mystery Machine
> '76 (ish) Palm Beach
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